Back to Glossary

Co-Signer

Also known as: Loan Guarantor, Joint Signer, Co-Borrower

A co-signer is an individual, often a family member or close friend, who agrees to share legal responsibility for a loan by guaranteeing repayment if the primary borrower defaults. Lenders require co-signers when the main borrower has limited or poor credit history, low income, or other risk factors that make loan approval uncertain.

By adding a co-signer with strong credit and stable finances, borrowers can increase their chances of approval and secure more favorable loan terms, such as lower interest rates. However, co-signing carries significant risks for the guarantor, as missed payments or default by the borrower will negatively impact both parties’ credit histories.

Additionally, lenders can pursue the co-signer for repayment, leading to financial strain or damaged relationships. Co-signers should only agree to this role if they trust the borrower and are fully prepared to assume the responsibility if necessary.

For borrowers, having a co-signer can be a powerful tool for accessing credit and building a stronger financial record, but it also requires a commitment to consistent repayment to protect the co-signer’s financial standing.

Example

Jake is 20 years old and applying for his first auto loan. Because his credit history is limited, the bank requires a co-signer. His mother, who has excellent credit, agrees to co-sign. Thanks to her support, Jake is approved with a much lower interest rate than he could have received alone.

See how this affects your loan